CN112886691B - Power supply switching device of diesel generator set - Google Patents
Power supply switching device of diesel generator set Download PDFInfo
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- CN112886691B CN112886691B CN202110121113.7A CN202110121113A CN112886691B CN 112886691 B CN112886691 B CN 112886691B CN 202110121113 A CN202110121113 A CN 202110121113A CN 112886691 B CN112886691 B CN 112886691B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0063—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with circuits adapted for supplying loads from the battery
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/061—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for DC powered loads
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
Abstract
The application relates to a power supply switching device of a diesel generating set, which comprises a power supply, a power supply switching circuit, a starting circuit, a transformer and a control system. The power supply comprises a common storage battery and two standby storage batteries; the power supply switching circuit can be switched into the starting circuit and a storage battery of the control system; the starting circuit comprises a starting device and a starting motor; rated working voltages of the control system and the power supply switching circuit are both smaller than the rated working voltage of the starting motor; one end of the transformer is connected with a power supply, and the other end of the transformer is connected with the control system. The power supply switching circuit can switch the standby storage battery connected to the starting circuit and the control system, and when the storage battery feeds power, the power supply switching of the uninterrupted storage battery is realized; and power isolation is realized through the power switching circuit and the transformer, and the working reliability of the system is guaranteed.
Description
Technical Field
The application relates to the field of power supply control of diesel generating sets, in particular to a power supply switching device of a diesel generating set.
Background
The lead-acid storage battery is generally used as a power supply of a direct current system of the diesel generator set, and in the running process of the diesel generator set, if the storage battery feeds power, the normal work of a starting motor and a control system can be influenced, and the working reliability of the diesel generator set is reduced. When designing a diesel generator set, part of users require the rated working voltage of a direct current system of the diesel generator set to be 12V, the rated working voltage of a starting motor of the diesel generator set is usually 24V, two 12V lead-acid storage batteries are usually selected as storage batteries, the storage batteries are used for supplying power to the starting motor, and one storage battery in the storage batteries is used for supplying power to the direct current system. In this way, there is power supply interference, so that the dc power supply system cannot operate stably.
Disclosure of Invention
The invention aims to provide a power supply switching device of a diesel generator set, which realizes uninterrupted power supply switching of a storage battery when the storage battery feeds power; and power isolation is realized through the power switching circuit and the transformer, and the working reliability of the system is guaranteed.
The technical scheme adopted by the invention is as follows: a power supply switching device of a diesel generating set comprises a power supply, a power supply switching circuit, a starting circuit, a transformer and a control system; the power supply comprises a first storage battery, a second storage battery and a third storage battery; the first storage battery, the second storage battery and the third storage battery are sequentially connected in series;
the power supply switching circuit comprises a selector switch, a first relay, a second relay, a third relay and a fourth relay; the starting circuit comprises a starting button, a stopping button, a starting motor and a fifth relay;
one end of a normally open contact of the change-over switch is connected with the positive electrode of the second storage battery, and the other end of the normally open contact of the change-over switch is connected with the positive electrode of a coil of the first relay; one end of a normally closed contact of the change-over switch is connected with the positive electrode of the second storage battery, and the other end of the normally closed contact of the change-over switch is connected with the positive electrode of a coil of the second relay;
the negative electrode of the coil of the first relay is connected with the negative electrode of the second storage battery; one end of a first normally open contact of the first relay is connected with the positive electrode of the second storage battery, and the other end of the first normally open contact of the first relay is connected with the positive electrode of a coil of the third relay;
the negative electrode of the coil of the second relay is connected with the negative electrode of the second storage battery; one end of a first normally open contact of the second relay is connected with the positive electrode of the second storage battery, and the other end of the first normally open contact of the second relay is connected with the negative electrode of the third storage battery; one end of a second normally open contact of the second relay is connected with the positive electrode of the second storage battery, and the other end of the second normally open contact of the second relay is connected with the positive electrode of a coil of the fourth relay;
the negative electrode of the coil of the third relay is connected with the negative electrode of the second storage battery; the common end of the first group of contacts of the third relay is connected with the starting motor, the normally open end of the first group of contacts of the fourth relay is connected with the normally open end of the second group of contacts of the fourth relay, and the normally closed end of the first group of contacts of the third relay is connected with the negative electrode of the second storage battery; the normally open end of the second group of contacts of the third relay is connected with the positive electrode of the second storage battery, and the normally closed end of the second group of contacts of the third relay is connected with the normally closed end of the first group of contacts of the fourth relay;
the negative electrode of the coil of the fourth relay is connected with the negative electrode of the second storage battery; the common end of the first group of contacts of the fourth relay is connected with the positive electrode of the control system, and the normally open end of the fourth relay is connected with the positive electrode of the first storage battery; the common end of the second group of contacts of the fourth relay is connected with the negative electrode of the control system, and the normally open end of the fourth relay is connected with the negative electrode of the first storage battery;
one end of the starting button is connected with the anode of the second storage battery, and the other end of the starting button is connected with the stopping button; the stop button is connected with the positive electrode of the coil of the fifth relay; the negative electrode of the coil of the fifth relay is connected with the negative electrode of the second storage battery; one end of a first normally open contact of the fifth relay is connected with the starting motor, and the other end of the first normally open contact of the fifth relay is connected with a common end of a second group of contacts of the third relay;
the positive electrode of the input end of the transformer is connected with the first normally open contact of the fifth relay, and the negative electrode of the input end of the transformer is connected with the starting motor; the positive electrode of the output end of the transformer is connected with the positive electrode of the control system, and the negative electrode of the output end of the transformer is connected with the negative electrode of the control system;
and the rated working voltage of the control system, the power supply switching circuit and the fifth relay is less than the rated working voltage of the starting motor.
The system further comprises an uninterrupted power supply control circuit, wherein the uninterrupted power supply control circuit comprises a first time delay relay and a second time delay relay; one end of a second normally open contact of the fifth relay is connected with the positive electrode of the second storage battery, and the other end of the second normally open contact of the fifth relay is connected with the positive electrode of a coil of the second time delay relay;
the coil of the first time delay relay is connected with the coil of the second time delay relay in parallel; a first normally open contact of the first time delay relay is arranged between the positive electrode of the output end of the transformer and a connecting circuit of the positive electrode of the control system; the second normally open contact of the first time delay relay is arranged between the negative electrode of the output end of the transformer and a negative connecting circuit of the control system;
the negative electrode of the coil of the second time delay relay is connected with the negative electrode of the second storage battery; the first normally closed contact of the second time delay relay is arranged between the common end of the first group of contacts of the fourth relay and the positive connecting circuit of the control system; the second normally closed contact of the second time delay relay is arranged between the connection of the common end of the second group of contacts of the fourth relay and the connection circuit of the negative electrode of the control system;
the delay time of the first delay relay is less than that of the second delay relay; and the rated working voltage of the first time delay relay and the rated working voltage of the second time delay relay are both smaller than the rated working voltage of the starting motor.
Further, the first delay relay and the second delay relay are both electrified delay relays.
Further, the delay time of the first delay relay is 3s, and the delay time of the second delay relay is 5 s.
Furthermore, the rated working voltage of the control system, the power supply switching circuit, the fifth relay, the first delay relay and the second delay relay is 12V, and the rated working voltage of the starting motor is 24V.
Further, the change-over switch is a toggle switch or a knob switch.
And one end of the power switch is connected with the anode of the second storage battery, and the other end of the power switch is connected with the change-over switch.
Further, the power switch is a toggle switch or a knob switch.
Further, the rated voltage of the first storage battery, the rated voltage of the second storage battery and the rated voltage of the third storage battery are all 12V.
The invention has the beneficial effects that:
(1) when the storage battery is fed or fails, the fed or failed storage battery is disconnected from the power supply loop through the power supply switching circuit and is connected to the standby storage battery; the uninterrupted power supply control circuit can realize uninterrupted power supply switching of the control system in the switching process of the storage battery and the transformer, so that the working reliability of the diesel generating set is improved;
(2) the power supply switching circuit and the transformer are matched to realize power supply isolation on the starting motor and the control system, so that the influence of the starting motor on the power supply voltage of the control system at the starting moment is reduced; compared with a power supply system in which power is directly supplied by a storage battery, the transformer can balance the electric quantity loss among the storage batteries, the voltage of the output end of the transformer is more stable, and the reliable work of the control system can be guaranteed.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is an electrical schematic diagram of embodiment 1 of the present invention.
Fig. 2 is an electrical schematic diagram of embodiment 2 of the present invention.
The reference signs explain: BAT01, first battery, BAT02, second battery, BAT03, third battery, SA01, change-over switch, SA02, switch, KM01, first relay, KM02, second relay, KM03, third relay, KM04, fourth relay, KM05, fifth relay, KT01, first delay relay, KT02, second delay relay, T01 transformer, SB01, start button, SB02, stop button, M start motor.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and thus the present invention is not limited to the specific embodiments disclosed below.
Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this application belongs. The use of "first," "second," and similar terms in the description and claims of this patent application do not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. Also, the use of the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships are changed accordingly.
Example 1:
as shown in fig. 1, a power switching device of a diesel generator set comprises a power supply, a power switching circuit, a starting circuit, a transformer T01 and a control system; the power supply comprises a first storage battery BAT01, a second storage battery BAT02 and a third storage battery BAT 03; the first storage battery BAT01, the second storage battery BAT02 and the third storage battery BAT03 are sequentially connected in series;
the power supply switching circuit comprises a switching switch SA01, a first relay KA01, a second relay KA02, a third relay KA03 and a fourth relay KA 04; the starting circuit comprises a starting button SB01, a stopping button SB02, a starting motor M and a fifth relay KA 05;
one end of a normally open contact of the switch SA01 is connected with the anode of a second storage battery BAT02, and the other end of the normally open contact of the switch SA01 is connected with the anode of a coil of the first relay KA 01; one end of a normally closed contact of the switch SA01 is connected with the anode of a second storage battery BAT02, and the other end of the normally closed contact of the switch SA01 is connected with the anode of a coil of a second relay KA 02;
the negative electrode of the coil of the first relay KA01 is connected with the negative electrode of a second storage battery BAT 02; one end of a first normally open contact KA01-1 of the first relay is connected with the anode of a second storage battery BAT02, and the other end of the first normally open contact KA 891 of the first relay is connected with the anode of a coil of a third relay KA 03;
the negative electrode of the coil of the second relay KA02 is connected with the negative electrode of a second storage battery BAT 02; one end of a first normally open contact KA02-1 of the second relay is connected with the anode of a second storage battery BAT02, and the other end of the first normally open contact KA02-1 of the second relay is connected with the cathode of a third storage battery BAT 03; one end of a second normally open contact KA02-2 of the second relay is connected with the anode of a second storage battery BAT02, and the other end of the second normally open contact KA 892 of the second relay is connected with the anode of a coil of a fourth relay KA 04;
the negative electrode of a coil of the third relay KA03 is connected with the negative electrode of a second storage battery BAT 02; the common end of the first group of contacts KA03-1 of the third relay is connected with the starting motor M, the normally open end of the first group of contacts KA04-2 of the fourth relay is connected with the normally open end of the second group of contacts of the fourth relay, and the normally closed end of the first group of contacts is connected with the negative electrode of a second storage battery BAT 02; the normally open end of the second group of contacts KA03-2 of the third relay is connected with the positive electrode of the second storage battery BAT02, and the normally closed end of the second group of contacts KA04-1 of the fourth relay is connected with the normally closed end of the second storage battery BAT 02;
the negative electrode of the coil of the fourth relay KA04 is connected with the negative electrode of a second storage battery BAT 02; the common end of a first group of contacts KA04-1 of the fourth relay is connected with the positive electrode of the control system, and the normally open end of the fourth relay is connected with the positive electrode of a first storage battery BAT 01; the common end of a second group of contacts KA04-2 of the fourth relay is connected with the negative electrode of the control system, and the normally open end of the fourth relay is connected with the negative electrode of the first storage battery BAT 01;
one end of the starting button SB01 is connected with the anode of the second storage battery BAT02, and the other end is connected with the stopping button SB 02; the stop button SB02 is connected to the positive coil of the fifth relay KA 05; the negative electrode of the coil of the fifth relay KA05 is connected with the negative electrode of a second storage battery BAT 02; one end of a first normally open contact KA05-1 of the fifth relay is connected with a starting motor M, and the other end of the first normally open contact KA05-1 of the fifth relay is connected with the common end of a second group of contacts KA03-2 of the third relay;
the positive electrode of the input end of the transformer T01 is connected with a first normally open contact KA05-1 of the fifth relay, and the negative electrode of the input end is connected with the starting motor M; the positive electrode of the output end of the transformer T01 is connected with the positive electrode of the control system, and the negative electrode of the output end is connected with the negative electrode of the control system;
rated working voltages of the control system, the power supply switching circuit and the fifth relay KA05 are all smaller than the rated working voltage of the starting motor M.
The embodiment 1 of the invention also comprises an uninterrupted power supply control circuit, wherein the uninterrupted power supply control circuit comprises a first time delay relay KT01 and a second time delay relay KT 02; one end of a second normally open contact KA05-2 of the fifth relay is connected with the anode of a second storage battery BAT02, and the other end of the second normally open contact KA05-2 of the fifth relay is connected with the anode of a coil of a second time-delay relay KT 02;
the coil of the first time delay relay KT01 is connected in parallel with the coil of the second time delay relay KT 02; a first normally open contact KT01-1 of the first time delay relay is arranged between the positive pole of the output end of the transformer T01 and the connecting circuit of the positive pole of the control system; a second normally-open KT02-1 contact of the first time delay relay is arranged between the negative electrode of the output end of the transformer T01 and a negative connecting circuit of the control system;
the negative pole of the coil of the second time delay relay KT02 is connected with the negative pole of a second storage battery BAT 02; a first normally closed contact KT02-1 of the second time delay relay is arranged between the common end of the first group of contacts KA04-1 of the fourth relay and a connecting circuit of the positive pole of the control system; the second normally closed contact KT02-2 of the second time delay relay is arranged between the connection of the common end of the second group of contacts KA04-2 of the fourth relay and the connection circuit of the negative pole of the control system; the delay time of the first delay relay KT01 is less than that of the second delay relay KT 02; rated working voltages of the first time delay relay KT01 and the second time delay relay KT02 are both smaller than the rated working voltage of the starting motor M.
In embodiment 1 of the present invention, both the first delay relay and the second delay relay are energized delay relays. Rated voltages of the first storage battery BAT01, the second storage battery BAT02 and the third storage battery BAT03 are all 12V. The change-over switch SA01 is a toggle switch or a knob switch, is provided with two control modes of a common gear and a standby gear, takes the first storage battery BAT01 and the second storage battery BAT02 as common storage batteries, and takes the third storage battery BAT03 and the second storage battery BAT02 as standby storage batteries. The rated working voltage of the control system, the power supply switching circuit, the fifth relay KA05, the first time-delay relay KT01 and the second time-delay relay KT02 is 12V, and the rated working voltage of the starting motor is 24V.
The specific working principle of embodiment 1 of the invention is as follows:
(1) starting:
when the switch SA01 is operated to the normal gear, the normally open contact of the switch SA01 is closed. A coil of the first relay KA01 is electrified, a first normally open contact KA01-1 of the first relay is closed, and the first storage battery BAT01 and the second storage battery BAT02 are connected in series; the second normally open contact KA01-2 of the first relay is closed, the coil of the third relay KA03 is electrified, the first group of contacts KA03-1 of the third relay and the second group of contacts KA03-2 of the third relay act, and the first storage battery BAT01 and the second storage battery BAT02 are connected into the diesel generator set. When the starting button SB01 is pressed, the coil of the fifth relay KA05 is electrified, the first normally open contact KA05-1 of the fifth relay and the second normally open contact KA05-2 of the fifth relay are closed, the coils of the first time-delay relay KT01 and the second time-delay relay KT02 are electrified, and the starting motor M is powered by the first storage battery BAT01 and the second storage battery BAT02.
When the normally open contact of the switch SA01 is closed, the normally closed contact of the switch SA01 is disconnected, the coil of the second relay KA02 cannot be electrified, the first normally open contact KA02-1 of the second relay is disconnected, and the third storage battery BAT03 supplies power to the control system. After the delay time of the first delay relay KT01 is up, a first normally open contact KT01-1 of the first delay relay and a second normally open contact KT01-2 of the first delay relay are closed, and the transformer T01 is connected to a control system; after the delay time of the second delay relay KT02 is over, the first normally closed contact KT02-1 of the second delay relay and the second normally closed contact KT02-2 of the second delay relay are disconnected, the third storage battery BAT03 is disconnected with the control system, and the transformer T01 supplies power to the control system. In embodiment 1 of the present invention, the delay time of the first delay relay KT01 is 3s, and the delay time of the second delay relay KT02 is 5 s.
The power isolation of the control system from the starter motor M is realized through the cooperation of the power switching circuit and the transformer T01. At the moment of starting the starting motor M, the instantaneous current is relatively high, so that the first storage battery BAT01 and the second storage battery BAT02 generate relatively large voltage drops, and at the moment, the output voltages of the first storage battery BAT01 and the second storage battery BAT02 both drop to about 10V, which is not beneficial to normal operation of the control system. After power isolation is carried out, the third storage battery BAT03 supplies power to the control system in the starting process, and the influence of larger voltage drop generated by the first storage battery BAT01 and the second storage battery BAT02 on the control system at the moment of starting the starting motor M can be avoided. After the start-up is completed, the control system is supplied with power by the transformer T01, and the transformer T01 can convert the voltage of the battery pack supplying power to the starter motor M into the supply voltage of the control system. Compared with a power supply system in which power is directly supplied by a storage battery, the transformer T01 can balance the power loss between two storage batteries in the storage battery pack, and the voltage of the output end of the transformer T01 is more stable, so that the influence of the power change of the storage battery on the power supply voltage of the control system can be weakened, and the reliable work of the control system can be guaranteed.
The delay time of the first delay relay KT01 is less than that of the second delay relay KT02, after starting is completed, the transformer T01 can be connected into the control system, then the third storage battery BAT03 is disconnected, and the control system cannot be powered off in the switching process of the third storage battery BAT03 and the transformer T01. In the switching process, the third storage battery BAT03 and the transformer T01 are in a parallel connection state, and at the moment, the voltage applied to two ends of the control system cannot exceed the rated voltage, so that the control system cannot be damaged; the parallel connection time of the third storage battery BAT03 and the transformer T01 is 2s, and the situation that the storage battery is damaged due to the fact that the third storage battery BAT03 and the transformer T01 are connected in parallel for too long time is avoided. The third storage battery BAT03 is only accessed to the control system for a short time in the starting process, and the third storage battery BAT03 is disconnected with the control system after the delay time of the second delay relay KT02 is up, so that the electric quantity is not consumed any more. When the storage batteries need to be switched, the third storage battery BAT03 is connected to the diesel generator set as a standby power supply.
(2) Handover
When the power of the common storage battery pack is insufficient (lower than 80 percent of the rated working voltage of the starting motor M) or the first storage battery BAT01 has a fault, the switch SA01 is operated to the standby gear, and the normally open contact of the switch SA01 is disconnected. When the coil of the first relay KA01 loses power, the first normally open contact KA01-1 of the first relay is disconnected, and the first storage battery BAT01 is disconnected with the second storage battery BAT 02; meanwhile, the second normally open contact KA01-2 of the first relay is disconnected, the coil of the third relay KA03 loses power, the first group of contacts KA03-1 of the third relay and the second group of contacts KA03-2 of the third relay reset, and the second storage battery BAT02 and the third storage battery BAT03 are connected into the diesel generator set. When the starting button SB01 is pressed, the coil of the fifth relay KA05 is electrified, the first normally open contact KA05-1 of the fifth relay and the second normally open contact KA05-2 of the fifth relay are closed, the coils of the first time-delay relay KT01 and the second time-delay relay KT02 are electrified, and the starting motor M is powered by the second storage battery BAT02 and the third storage battery BAT03.
When the normally open contact of the switch SA01 is opened, the normally closed contact of the switch SA01 is closed, the coil of the second relay KA02 is electrified, the first normally open contact KA02-1 of the second relay is closed, and the second storage battery BAT02 and the third storage battery BAT03 are connected in series; the second normally open contact KA02-2 of the second relay is closed, the coil of the fourth relay KA04 is electrified, the first group of contacts KA04-1 of the fourth relay and the second group of contacts KA04-2 of the fourth relay act, and the third storage battery BAT03 is disconnected with the control system. After the delay time of the first delay relay KT01 is over, the first normally open contact KT01-1 of the first delay relay and the second normally open contact KT01-2 of the first delay relay are closed, and the transformer T01 is connected into the control system to supply power to the control system.
The switching of the common storage battery pack and the standby storage battery pack can be carried out by operating the switch SA01, so that the emergency starting of the diesel generator set is realized, the influence of the storage battery feed and the fault on the diesel generator set is reduced, and the power supply reliability of the diesel generator set is improved.
(3) Shutdown
The stop button SB02 is pressed, the coil of the fifth relay KA05 loses electricity, the first normally open contact KA05-1 of the fifth relay and the second normally open contact KA05-2 of the fifth relay are disconnected, the starting motor M loses electricity, and the diesel generating set is stopped.
Example 2:
in embodiment 2 of the present invention, on the basis of embodiment 1, the battery pack further includes a power switch SA02, wherein one end of the power switch SA02 is connected to the positive electrode of the second battery BAT02, and the other end is connected to the switch SA01. The power switch SA02 is a toggle switch or a knob switch, and is used for controlling the connection between the anode of the second battery BAT02 and the power switching circuit and the uninterruptible power supply control circuit. Before the diesel generator set is started, a power switch SA02 is operated, a normally open contact of a power switch SA02 is closed, the anode of a second storage battery BAT02 is communicated with the power switching circuit and the uninterrupted power supply control circuit, and the power switching circuit and the uninterrupted power supply control circuit can work normally; after the diesel generator set is shut down, the power switch SA02 is operated, the normally open contact of the power switch SA02 is disconnected, and the anode of the second storage battery BAT02 is disconnected with the power switching circuit and the uninterruptible power supply control circuit, so that the electric quantity of the storage battery is prevented from being consumed.
In the embodiments 1 and 2 of the invention, when the storage battery is fed or fails, the fed or failed storage battery is disconnected from the power supply loop through the power supply switching circuit, and a standby storage battery is connected. The uninterrupted power supply control circuit can realize uninterrupted power supply switching of the control system in the switching process of the storage battery and the transformer T01, and improves the working reliability of the diesel generator set. Through the cooperation of the power switching circuit and the transformer T01, power isolation is realized on the starting motor M and the control system, and the influence of the starting motor M on the power supply voltage of the control system at the starting moment is reduced; compared with a power supply system in which power is directly supplied by a storage battery, the transformer T01 can balance the power loss among the storage batteries, the output end voltage of the transformer T01 is more stable, and the reliable work of the control system can be guaranteed.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A power supply switching device of a diesel generating set is characterized by comprising a power supply, a power supply switching circuit, a starting circuit, a transformer and a control system; the power supply comprises a first storage battery, a second storage battery and a third storage battery; the first storage battery, the second storage battery and the third storage battery are sequentially connected in series;
the power supply switching circuit comprises a selector switch, a first relay, a second relay, a third relay and a fourth relay; the starting circuit comprises a starting button, a stopping button, a starting motor and a fifth relay;
one end of a normally open contact of the change-over switch is connected with the positive electrode of the second storage battery, and the other end of the normally open contact of the change-over switch is connected with the positive electrode of a coil of the first relay; one end of a normally closed contact of the change-over switch is connected with the positive electrode of the second storage battery, and the other end of the normally closed contact of the change-over switch is connected with the positive electrode of a coil of the second relay;
the negative electrode of the coil of the first relay is connected with the negative electrode of the second storage battery; one end of a first normally open contact of the first relay is connected with the positive electrode of the second storage battery, and the other end of the first normally open contact of the first relay is connected with the positive electrode of a coil of the third relay;
the negative electrode of the coil of the second relay is connected with the negative electrode of the second storage battery; one end of a first normally open contact of the second relay is connected with the positive electrode of the second storage battery, and the other end of the first normally open contact of the second relay is connected with the negative electrode of the third storage battery; one end of a second normally open contact of the second relay is connected with the positive electrode of the second storage battery, and the other end of the second normally open contact of the second relay is connected with the positive electrode of a coil of the fourth relay;
the negative electrode of the coil of the third relay is connected with the negative electrode of the second storage battery; the common end of the first group of contacts of the third relay is connected with the starting motor, the normally open end of the first group of contacts of the fourth relay is connected with the normally open end of the second group of contacts of the fourth relay, and the normally closed end of the first group of contacts of the third relay is connected with the negative electrode of the second storage battery; the normally open end of the second group of contacts of the third relay is connected with the positive electrode of the second storage battery, and the normally closed end of the second group of contacts of the third relay is connected with the normally closed end of the first group of contacts of the fourth relay;
the negative electrode of the coil of the fourth relay is connected with the negative electrode of the second storage battery; the common end of the first group of contacts of the fourth relay is connected with the positive electrode of the control system, and the normally open end of the fourth relay is connected with the positive electrode of the first storage battery; the common end of the second group of contacts of the fourth relay is connected with the negative electrode of the control system, and the normally open end is connected with the negative electrode of the first storage battery;
one end of the starting button is connected with the anode of the second storage battery, and the other end of the starting button is connected with the stopping button; the stop button is connected with the positive electrode of the coil of the fifth relay; the negative electrode of the coil of the fifth relay is connected with the negative electrode of the second storage battery; one end of a first normally open contact of the fifth relay is connected with the starting motor, and the other end of the first normally open contact of the fifth relay is connected with a common end of a second group of contacts of the third relay;
the positive electrode of the input end of the transformer is connected with the first normally open contact of the fifth relay, and the negative electrode of the input end of the transformer is connected with the starting motor; the positive electrode of the output end of the transformer is connected with the positive electrode of the control system, and the negative electrode of the output end of the transformer is connected with the negative electrode of the control system;
and the rated working voltages of the control system, the power supply switching circuit and the fifth relay are all less than the rated working voltage of the starting motor.
2. The power switching device of the diesel generator set according to claim 1, further comprising an uninterruptible power supply control circuit, wherein the uninterruptible power supply control circuit comprises a first delay relay and a second delay relay; one end of a second normally open contact of the fifth relay is connected with the positive electrode of the second storage battery, and the other end of the second normally open contact of the fifth relay is connected with the positive electrode of a coil of the second time delay relay;
the coil of the first time delay relay is connected with the coil of the second time delay relay in parallel; a first normally open contact of the first time delay relay is arranged between the positive electrode of the output end of the transformer and a connecting circuit of the positive electrode of the control system; the second normally open contact of the first time delay relay is arranged between the negative electrode of the output end of the transformer and a negative connecting circuit of the control system;
the negative electrode of the coil of the second time delay relay is connected with the negative electrode of the second storage battery; the first normally closed contact of the second time delay relay is arranged between the common end of the first group of contacts of the fourth relay and the positive connecting circuit of the control system; the second normally closed contact of the second time delay relay is arranged between the connection of the common end of the second group of contacts of the fourth relay and the connection circuit of the negative electrode of the control system;
the delay time of the first delay relay is less than that of the second delay relay; and the rated working voltage of the first time delay relay and the rated working voltage of the second time delay relay are both smaller than the rated working voltage of the starting motor.
3. The diesel generator set power switching device of claim 2, wherein the first delay relay and the second delay relay are both energized delay relays.
4. The power switching device of the diesel generator set according to claim 2 or 3, wherein the delay time of the first delay relay is 3s, and the delay time of the second delay relay is 5 s.
5. The power supply switching device of the diesel generator set according to claim 1 or 2, wherein rated operating voltages of the control system, the power supply switching circuit, the fifth relay, the first delay relay and the second delay relay are all 12V, and rated operating voltage of the starting motor is 24V.
6. The power switching device of a diesel generator set according to claim 1, wherein the switch is a toggle switch or a rotary switch.
7. The power switching device of the diesel generator set according to claim 1, further comprising a power switch, wherein one end of the power switch is connected with the positive electrode of the second storage battery, and the other end of the power switch is connected with the switch.
8. The power switching device of a diesel generator set according to claim 7, wherein the power switch is a toggle switch or a rotary switch.
9. The power switching device of the diesel generator set according to claim 1, wherein the rated voltage of the first storage battery, the second storage battery and the third storage battery is 12V.
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